Where do you suppose the Addams family got all their money?

https://youtu.be/VHDWddZhay0?is=PSPSWMf92XCy1P2a
The Addams family is often portrayed with great wealth as well as an unbelievable naïveté about how many people in their lives are trying to get to those riches. It’s funny and all, but none of them ever seem to leave for work and they never mention a family business from which all their wealth might have originated. Furthermore, they keep all their valuables in a vault in their home. So they are not even earning interest from the banks.
Where do you suppose the Addams family got all that money?
Where do you suppose the Addams family got all their money?
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